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Home >> Buick >> 2003 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.1L Engine >> Diagnostic Tests >> DTC P0201-P0206: Injector Control Circuit >> Test Description
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Test Description

The numbers below refer to the step numbers in the diagnostic procedure.

  1. 4  - This step isolates the condition. If the test light blinks, the PCM is providing ground to the fuel injector.
  2. 5  - This step tests if a ground is constantly being applied to the fuel injector.
  3. 6  - This step isolates the circuit between the multi-way connector and the PCM. An open or short to voltage on the fuel injector control circuit will not allow the test light to blink.
  4. 8  - This step inspects for fuel injector harness damage between the multi-way connector and the upper intake manifold. Careful inspection may isolate the condition before removal of the upper intake manifold.
  5. 13  - This step isolates the circuit between the multi-way connector and the fuel injector. A short to voltage on the fuel injector control circuit will set this DTC.
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